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Valve clearance.

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Valve clearance.
Robert Foreman Offline
Precision Engineer
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Joined: Aug 2017 Posts: 557 Threads: 89
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Location: Deepest darkest Kent
#1
30-03-2019, 08:49 PM
How much clearance does a valve need at full lift in the combustion chamber ?
   For the best flow should there be a good clearance above the valve or not ?
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Alan Offline
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#2
30-03-2019, 09:42 PM
Ideally there should be space above the valve, but in reality there is probably more benefit in maintaining a good compression ratio. I usually fit the head without a gasket. If the valves don’t hit the head, it should be ok with the gasket fitted.
Alan Fairless
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Chris KC Offline
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#3
31-03-2019, 08:41 AM
For optimal flow you just want it as far open as possible. I agree with Alan, as long as it's not physically touching the head you should be OK.
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